My social workers assessment regarding a Section 47 investigation is missing vital information. What do I do now? ?

On 15th Jan my 4yo daughter made a complaint regarding sexual abuse at her fathers house made by her father. Although the disclosure initially made to me was also made to her school teacher and a child phycologist, since a disclosure wasn't made to the social worker on 3 occasions, the social worker has advised arranging contact between my daughter and her father. The disclosures have not been mentioned in the final assessment which states that the situation is likely to have been misconstrued. The initial disclosure included my daughter describing the sensation, that it hurt and that her dad wakes her in the night and that's when it happens. She says it only happens when Stepmum is asleep. She then said to her school teacher the same info, this time saying that it only happens when Stepmum is at her parents house and Dad puts scary films on when it's happening. She also told a psychologist that she gets treats afterwards. None of this info has been included in the assessment, no risks have been highlighted and no safeguarding recommendations have been made. I am in the UK, how do I complain? And should I contact a solicitor now? My daughter has had no contact with Dad since Jan and I am lost as to allow him to see her in a contact centre or not at all. Social worker has also missed out a character reference made by Dad's stepfather in the assessment which expresses concerns of aggressive and abusive behaviour. Thanks